package net.hzlj.platform.enterprise.utils;

import android.text.TextUtils;
import android.util.Base64;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.security.MessageDigest;

/**
 * @ClassName: EncoderUtils
 * @Description: 加密
 * @Author: Administrator zhangyujn1989ok@gmail.com
 * @Date: 2016-2-26 19:39:56
 */
public class EncoderUtils {

    private static final String ALGORITHM = "MD5";

    private static final char[] HEX_DIGITS = { '0', '1', '2', '3', '4', '5',
            '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

    /**
     * encode string
     *
     * @param algorithm
     * @param str
     * @return String
     */
    public static String encode(String algorithm, String str) {
        if (str == null) {
            return null;
        }
        try {
            MessageDigest messageDigest = MessageDigest.getInstance(algorithm);
            messageDigest.update(str.getBytes());
            return getFormattedText(messageDigest.digest());
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

    }

    /**
     * encode By MD5
     *
     * @param str
     * @return String
     */
    public static String encodeByMD5(String str) {
        if (str == null) {
            return null;
        }
        try {
            MessageDigest messageDigest = MessageDigest.getInstance(ALGORITHM);
            messageDigest.update(str.getBytes());
            return getFormattedText(messageDigest.digest());
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

    }

    /**
     * Takes the raw bytes from the digest and formats them correct.
     *
     * @param bytes
     *            the raw bytes from the digest.
     * @return the formatted bytes.
     */
    private static String getFormattedText(byte[] bytes) {
        int len = bytes.length;
        StringBuilder buf = new StringBuilder(len * 2);
        // 把密文转换成十六进制的字符串形式
        for (int j = 0; j < len; j++) {
            buf.append(HEX_DIGITS[(bytes[j] >> 4) & 0x0f]);
            buf.append(HEX_DIGITS[bytes[j] & 0x0f]);
        }
        return buf.toString();
    }

    // 加密
    public static String base64Encode(String str){
        //byte[] info = Base64.encode(str.getBytes(), Base64.DEFAULT);
        if (TextUtils.isEmpty(str)) {
            return null;
        }
        try {
            return URLEncoder.encode(str, "utf-8");
        } catch (Exception e) {
            return null;
        }
        //return new String(info);
    }

    // 解密
    public static String base64Decode(String str) {
        //byte[] info = Base64.decode(str, Base64.DEFAULT);
        if (!TextUtils.isEmpty(str)) {
            try {
                return URLDecoder.decode(str, "utf-8");
            } catch (UnsupportedEncodingException e) {
                return null;
            }

        }else{
            return null;
        }
        //return new String(info);
    }

    //加密--byte转String
    public static String base64EncodeToString(byte[] b){
        return Base64.encodeToString(b, Base64.DEFAULT);
    }

    //字符串解密byte[] 型
    public static byte[] base64DecodeToByte(String str){
        try {
            return Base64.decode(str, Base64.DEFAULT);
        } catch (Exception e) {
            return null;
        }
    }

    public static String base64EncodeContent(String str) {
        if (StringUtils.isNotEmpty(str)) {
            byte[] info = Base64.encode(str.getBytes(), Base64.DEFAULT);
            try {
                return new String(info, "utf-8");
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
        }
        return "";
    }


    public static void main(String[] args) {
        System.out.println("111111 MD5  :"
                + encodeByMD5("111111"));
        System.out.println("111111 MD5  :"
                + encode("MD5", "111111"));
        System.out.println("111111 SHA1 :"
                + encode("SHA1", "111111"));
    }
}
